Why do System Objects treat row vectors as column vectors in MATLAB R2011a?

When using MATLAB R2011a, System Objects (Convolver, Crosscorrelator, SignalReader) treat row vectors as column vectors.  Why is this?

Answer 1

[MathWorks Support Team]

This is expected behavior as these System Objects expect an input that is a column vector in MATLAB releases up to R2011a.

To work around this limitation you can transpose the row vector into a column vector before using it with the System Object.

In MATLAB R2011b, a warning is displayed when using row vector inputs to these kind of System Objects.